Sir Keir Starmer is preparing to announce a crackdown on children's access to social media within days.
A speech planned for next week will include a new policy after ministers examined options such as a blanket ban on under‑16s, guidance on children's screen use and steps to block nude images on children's phones.
"When the consultation closed last month, Sir Keir said the measures would be a 'game‑changer'."
Starmer had previously resisted restrictions, but pressure from the Conservatives, the Liberal Democrats and dozens of Labour MPs prompted the government to launch a public consultation on a ban in March.
There have also been discussions about exempting elements of social media judged to be less harmful.
The announcement will come as Starmer spends several days at the G7 summit in France and as the Makerfield by‑election, in which Andy Burnham is Labour's candidate, takes place on Thursday.
